Flame Acceleration and Overpressure Development in A Semiopen Tube with Repeated Obstacles

doi:10.1016/S1540-7489(02)80043-8

IMECH-IR > 力学所知识产出(1956-2008)

	Flame Acceleration and Overpressure Development in A Semiopen Tube with Repeated Obstacles
	Yu LX(余立新); Sun WC(孙文超); Wu CK(吴承康); Yu, LX (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China.
发表期刊	PROCEEDINGS OF THE COMBUSTION INSTITUTE
	2002
卷号	29 页码:321-327
ISSN	0082-0784
摘要	An investigation of the dependence of turbulent flame acceleration and overpressure in a semiopen tube on the configuration of obstacles has been performed in a flame propagation tube with one end closed and the other open, having an 80 mm inner diameter, a 5 in length, and repeated obstacles. Three kinds of obstacle shapes have been used for various blockage ratios and spacing of obstacles. There is evidence that the influence of the obstruction characteristics on the flame speed and overpressure is different in the various flame regimes. In the low-speed combustion regime, the highest terminal flame speed is obtained with the blockage ratio of BR = 0.3-0.4. In the choking regime, the maximum flame speed is insensitive to the blockage ratio, and a blockage ratio of about 0.5 generates the highest peak overpressure. In the detonation regime, the maximum flame speed and overpressure decrease with increasing blockage ratio due to the severe momentum losses induced by the blockage effect of the obstacles, and at the same time, the detonative range is observed to become narrower. The steady flame speed is, independent of the shape of obstacles when the blockage ratio is the same, and the spacing of obstacles plays a role only in determining the flame acceleration rate rather than the steady flame speed; the highest mean flame speed and peak overpressure are obtained when the spacing of obstacles is about equal to the inner diameter of the flame tube. In addition, the unsteady compressible flow model with correction for the influence of turbulence Mach number on viscosity dissipation and pressure dilatation was formulated, and numerical studies using the eddy-break-up combustion model were made to predict the flame acceleration and the development of overpressure in the tube. The comparison of calculated overpressure and flame speeds with experimental data shows good agreement.
DOI	10.1016/S1540-7489(02)80043-8
收录类别	SCI
语种	英语
WOS记录号	WOS:000182866100039
关键词[WOS]	GASEOUS EXPLOSIONS ; SPHERICAL VESSELS ; TURBULENCE
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering
WOS类目	Thermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/58481
专题	力学所知识产出(1956-2008)
通讯作者	Yu, LX (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Yu LX,Sun WC,Wu CK,et al. Flame Acceleration and Overpressure Development in A Semiopen Tube with Repeated Obstacles[J]. PROCEEDINGS OF THE COMBUSTION INSTITUTE,2002,29:321-327.
APA	余立新,孙文超,吴承康,&Yu, LX .(2002).Flame Acceleration and Overpressure Development in A Semiopen Tube with Repeated Obstacles.PROCEEDINGS OF THE COMBUSTION INSTITUTE,29,321-327.
MLA	余立新,et al."Flame Acceleration and Overpressure Development in A Semiopen Tube with Repeated Obstacles".PROCEEDINGS OF THE COMBUSTION INSTITUTE 29(2002):321-327.

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